Getting Started > Upgrading to CitectSCADA v7.20 > Migration Tool > Converting Memory Variables
Converting Memory Variables

A memory variable is a variable with its I/O Device Port property set to either "Memory" or "MEM_PLC".

If there are multiple I/O Devices with the same name, possibly on different I/O Servers, then the device would not be considered as a memory device regardless of its port value. In other words the Migration tool will not process the variables for memory devices with duplicate names.

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